I think you are talking about columns on a sheet, not columns on a dashboard. Dashboards contain sheets.

Although, maybe you have a bunch of single-column sheets, and you are asking how to hide a specific sheet based on a parameter selection.

And parameters are single-value objects. You might have "All" as one of the choices in your parameter list, and if that's the case we can discuss how to handle that. But I think you are actually asking about FILTER selections, not parameter selections, and that would require different ways of dealing with the special condition you want to do.

So your question depends on the specific things you are manipulating here.

I think it would be easier to nail this down if I had a sample workbook that shows what you are trying to do. Do you know how to export a packaged workbook and upload it here?

i am talking about hiding a column on a sheet. I dont have single column sheets.

I am working with two different sql tables and joined common dimension (Department Incharge) by parameter. Parameter have Names of Incharge people and "All" as an option and i want to hide a column when "All" is selected because it will too many values in other column when "All" is selected so i want to hide that. But when other values are selected i want to show that column.

I have attached a sheet. It doesn't show All in list.. however when i try to add All calculated field only gives option as 0 not 1. After adding All i want to hide dept column on profit sheet when all is selected from parameter.